Integrated active duration uvc exposure for air curtain

ABSTRACT

An air curtain air cleaner and sanitation system that incorporates established active UVC light projection technology with threshold air delivery air curtains to provide conditioned airflow by outward UVC light beam projection into the return airflow in a structure while maintaining an air control barrier between openings in a structure.

This application claims the benefit of U.S. Provisional Application No. 63/125,060 filed on Dec. 14, 2020.

BACKGROUND OF THE INVENTION 1. Technical Field

This invention relates to the field of air curtains used to create an airflow defined barrier in openings and structures between interior and exteriors for different conditioned spaces within a structure for environmentally retention there between and active air disinfection by prolonged exposure to UVC light.

2. Description of Prior Art

Prior art air curtains have provided air blower assemblies that include air streaming conditioning such as heating and minimal ambient air filtration and recirculation as it leaves the blower through a directional outlet nozzle to provide a laminar airflow barrier as required. Examples of such air curtains can be seen in U.S. Pat. No. 5,984,649 and applicants U.S. Pat. No. 8,568,210 which discloses venturi heating elements within an air curtainconfiguration.

Prior art air disinfection systems have been developed that rely on UVC light constructions within defined airflow passageways or UVC light directed onto air impinged surfaces for limited sanitation with the air transferring within the air transfer enclosure.

Such UVC light systems for air treatment define airflow speed within fan containment enclosures to purify air as it passes there through.

SUMMARY OF THE INVENTION

An air curtain unit with enhanced projection airflow conditioning properties having multiple blower fans with elongated air outlet directing discharge vanes and air intake directional baffles with multiple UVC light projection bulbs to produce directed outward UVC light beam into the return airstream before air curtain intake and conditioning. UVC light bulbs are known for effective air environmental sanitation based on duration of UVC exposure. Such direct UVC light radiation above the occupied area in the structure thereby provides an extended contact duration with the return air stratification induced by the air curtain's bilateral airstream after floor contact.

DESCRIPTION OF THE DRAWINGS

FIG. 1 is a side elevational view of the air curtain UVC beam generation system of the invention with portions cut away.

FIG. 2 is a perspective view of the air curtain with a portion removed.

FIG. 3 is a perspective view of the assembled UVC air curtain.

FIG. 4 is an enlarged end elevational view thereof with portions cut away illustrating return air treatment inflow and outflow.

FIG. 5 is a graphic illustration of the UVC beam treatment inflow of the air curtain of the invention installed in a threshold doorway between interior and exterior environments of a structure.

DETAILED DESCRIPTION OF THE INVENTION

Referring to FIGS. 1, 2 and 4 of the drawings, an enhanced UVC light air treatment air curtain assembly 10 of the invention can be seen having a generally rectangular housing 11 with wall mounting wall portion 12 and, in this example, a top 13, an end wall enclosure panels 13A and 136 and integral base pan 14 extending therefrom. A pair air blower assemblies 15 and 16 have an interconnected central drive electric motor assembly 17 mounted there between for bi-directional driving as is well known within the art. The electric motor assembly 17 is mounted within a blower assembly frame 18 extending from the surface base pan 14 of the housing 11. The blower assembly frame 18 supports a blower housing 19 with respective blower fan cages supported in rotational relationship therein and are connected to and driven by respective motor drive shafts 21 and 22 of the electric motor assembly 17. A blower outflow chase 23 is integrally formed by the blower housing 19 with an elongated adjustable nozzle outlet 24. A unitized rectangular air inlet and light directional baffle assembly 25 is removably mounted to a corresponding opening in a front wall 13C of the housing 11.

A unit power supply and control panel 26 is positioned adjacent the motor assembly 17, in this example, within the housing 11, best seen in FIG. 2 of the drawings which will provide integrated proportional programmable power and control to the air curtains components as will be well understood by those skilled in the art.

The hereinbefore described air curtain housing 11 therefore defines an interior return airflow path with recirculation inlet air IA being drawn through the return air inlet baffle assembly 25 into a downstream conditioning chamber 27 defined between the inlet baffle assembly 25 and the hereinbefore described blower assemblies 15 and 16. A heater element HE provides for conditioning air from the blower assemblies 15 and 16 indicated by inflow arrows IA.

The return inlet air flow IA is treated by one or more UVC bulbs 28 between the mounted baffle 25 and the return air conditioning chamber 27, as best seen again in FIGS. 4 and 5 of the drawings, as described in greater detail hereinafter.

The UVC bulbs 28 are powered by a UVC bulb ballast 28A via power control panel 26 and will project a beam of UVC light 29 from the unit into structure and the stratified return air laminate stream as seen best in FIGS. 4 and 5 of the drawings.

UVC light is electro-magnetic radiation with short wave lengths. UVC is termed as germicidal UV generally and is of a wave length between 200 NM and 300 NM which are strongly absorbed by nucleus acids resulting in the death or inactivation of the organism so targeted.

UVC light generated in the baffle assembly 25 as a directed beam 25A provides the required UV intensity to time ratio producing a room air treatment stratification as illustrated in FIG. 5 of the drawings with UV-C light beam flow indicated by directional arrows and corresponding structure air circulation induced by induced return incoming recirculation airflow arrows IRC towards the air curtain inflow inlet I.

It will therefore be apparent that the UVC light treatment air curtain assembly 10 of the invention when mounted above the traditional threshold structure opening 31 as seen in FIG. 5 of the drawings will impart airflow paths within the structures forming a dual stratified circulation into the building interior I, indicated by directional airflow arrows AF as it is deflected off interior engagement surfaces 32 of the structure S opening 31. The flow velocity generated by the UVC air curtain 10 will therefore push into the structure S interior and then be returned in a recirculation pattern RCP for extended exposure to the UVC light beam directed by the air curtain inflow inlet baffle assembly 25.

The high velocity air curtain separation of interior I and exterior E achieved will be by flow vector determination providing a 30% by volume airflow from the air current flow out to the exterior indicated at 32A in FIG. 5 of the drawings. Thereby providing the bulk of the UVC beam treated airflow to circulate within the interior I of the structure as illustrated for recirculation pattern thereby.

It will thus be seen that a new and novel application of air curtain UVC projection radiation treated inflow and outflow of airflow has been illustrated and described in building threshold opening traditional air curtain applications as well as alternate nontraditional interior positional placement to treat large volume interior structures with the advantages of active UVC radiation projection duration to achieve enhanced air quality. It will be apparent to those skilled in the art that various changes and modification may be made thereto without departing from the spirit of the invention, therefore I claim: 

1. UVC light source for an air curtain comprises, an air curtain having a plurality of blower units, each blower unit having an axle impellor cage driven by an electric motor there between, a housing for each of said impellor cages defining a directional nozzle airflow outlet and a return air inlet baffle assembly aligned with said respective impellor cages, a heating element within a downstream condition chamber, said UVC light source positioned between said inlet baffles and said condition chamber, said UVC light source generating a germicidal UV radiation beam directed by said return inlet baffles as UV treatment airflow paths within a structure, said UVC equipped air curtain mounted above a threshold structure opening.
 2. The UVC light source for an air curtain set forth in claim 1 wherein said UVC light source comprises, at least one UVC light bulb powered by a ballast with a source of electrical energy.
 3. The UVC light source for an air curtain set forth in claim 1 wherein said UV treated airflow paths within said structure comprises, dual stratified circulation directed off of interior engagement surfaces beyond said threshold structure opening.
 4. The UVC light source for an air curtain set forth in claim 1 wherein said germicidal UVC radiation comprises, electromagnetic radiation with short wave length between 200 nu and 300 nu optimal target organism associated with UV air treatment within the art.
 5. The UVC light source for an air curtain set forth in claim 1 wherein said directed UV radiation beam producing a structure room air treatment stratification corresponds to structure air circulation induced by return incoming recirculated airflow towards the air curtain inflow inlet and direct nozzle airflow threshold outlet.
 6. A threshold air curtain having UVC light projecting bulbs within baffle directed return air inlet, a UV treated air circulation pattern within a structure comprising, an outward projection of UVC radiation within an incoming recirculation airflow, a dual stratification circulation within the structure by high velocity air circulated outflow by threshold separation of said air curtain.
 7. The threshold air curtain having a UVC light projecting bulb set forth in claim 6 wherein said threshold air curtain comprises, a plurality of blower units within a housing, an electrical motor direct drive-in communication with said respective blower, a source of power from said motor and a directional blower nozzle outlet and air inflow recirculating inlet.
 8. The threshold air curtain set forth in claim 6 wherein said dual stratification circulation further comprises, high velocity air curtain separation of structure interior and exterior providing 30% by volume exterior airflow and 70% by volume internal airflow off of interior engagement surfaces defining a return recirculation pattern of extended exposure to a UVC light beam from return air baffle outlet of said air curtain. 